Is There Performance Loss If I Delete Frequently

Apr 17, 2008

I use SQL2005 EE to capture the "In Progress Data" from the Devices and have connected it to the Main server-SQL2005 SE thro linked Server. I Run a Job that updates the Main server and Clears the "in Process Data".
Off late I have been seeing that the systems with SQL2005 EE have gone slow ? I have not investigated the reason. But wanted to find out if using this method ,should I need to take additional precautions ?

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Huge Performance Loss When Using Variables

Oct 26, 2007

was trying to performance tune a query and came up on this weird issue(Weird to me atleast.. possibly because I am a newbie:-))).

When I run the query mentioned below, I get the results in 1 second, while the same query, if I declare a variable for the value I am comparing, it takes 40 seconds. I am on SQL Server 2000. Both queries are being run in the same DB on the same tables and the only difference between the two is that the date has been declared as a variable. I am able to consistantly reproduce this. Tried casting the variable, declaring it as varchar , replacing the date by getdate() at both places, but the moment I use the variable, the performance goes for a toss. Has anyone came across any similar issues?
TIA
Callista

Query 1
select ae.Col1, ae.Col2, ae.Col3, ae.Col4, ge.Col4, c.Col5, 0
from table1 ae WITH (INDEX=ind_Col3 NOLOCK), table2 ge with (nolock), table3 c with (nolock)
where ae.Col1 = ge.Col1
AND ae.Col4 = c.Col1
AND ae.Col3 > '2007-10-25 14:18:12.380'
and ae.Col6 is not null

Query 2
declare @MyVariable datetimeselect @MyVariable = '2007-10-25 14:18:12.380'
select ae.Col1, ae.Col2, ae.Col3, ae.Col4, ge.Col4, c.Col5, 0
from table1 ae WITH (INDEX=ind_Col3 NOLOCK), table2 ge with (nolock), table3 c with (nolock)
where ae.Col1 = ge.Col1
AND ae.Col4 = c.Col1
AND ae.Col3 > @MyVariable
and ae.Col6 is not null

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Jan 6, 2006

I am doing a mass update of our SQL script files by adding dbo.to all references to the tables.The code is also adding dbo. in front of existing lines of codethat are like this:SELECT CLIENT.FIRSTNAME,CLIENT.LASTNAMEFROM CLIENT....The mass update is causing this to become:SELECT dbo.CLIENT.FIRSTNAME,dbo.CLIENT.LASTNAMEFROM dbo.CLIENT....My goal is to see FROM dbo.CLIENTbut even the column names are getting the "dbo."added, so my question is if there's any performanceloss or any other side effect if I end up all my columnswith a preceeding "dbo."?Thank you

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Jan 15, 2008

I've about 2-10 millions records to delete. Is there anyway to have this delete statement run faster?


while exists (select * from table_report WHERE report_date between @from_date and @to_date)

begin

DELETE TOP (10000) FROM table_report WHERE report_date between @from_date and @to_date

end


Thanks,
-Ash

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Jul 23, 2005

Hi!I'm experiencing the following experience problem with my SQL Server 2000.Explanation a' la example;1.I insert data using my SP; EXEC dbo.up_DataInsertThis is fine, SQL Profiler duration only a few ms.2.I try to select the data.select * from dbo.tblData where DataNumber = 283279This is fine, SQL Profiler duration only a few ms.3.delete from dbo.tblData where DataNumber = 283279This is NOT fine, SQL Profiler duration up to 50 seconds!!!I have got a unique index with ignore duplicate key and the table has about180.000 records.What could be wrong here??/Magnus

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Performance Impact When Using On Delete Cascade

Jan 15, 2008

I want to use "on delete cascade" in one of my tables but I'm worried though whether this can affect the performance when having millions of records. To explain more I'm working on a social networking website and I have two tables UserAccounts, in which I only keep the username and password and a few related fields, and Profiles in which I keep the profile data for users, I want to be sure that I won't have any records in the Profiles table without corresponding records in the UserAccounts table. Please see the DDL below to understand more the structure of the tables:

CREATE TABLE UserAccounts
(
UserID INT NOT NULL IDENTITY(1,1) PRIMARY KEY,
UserName VARCHAR(20) NOT NULL,
Password VARCHAR(20) NOT NULL,
--other fields (e.g. last login .. etc)
)


CREATE TABLE Profiles
(
UserID INT NOT NULL REFERENCES UserAccount(UserID),
-- other fields (e.g. birthdate, nationality .. etc)
)


Any suggestions are highly appreciated...

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Oct 10, 2000

I have a query that retrieves a single record from searching on two tables.
The statement goes like this...
select sum(amount) from Table1 A union Table2 B on a.id = b.id
where date < ### and date > #### and account = ###

As people are running a particular report, this statement is executed time and
time again to pull up the numbers necesarry for the report. When the report gets slow, I can speed it up by updating the statistics. My concern is that I'm having to update the statistcs every hour; otherwise, the query becomes slow. I have noticed that users are inserting data while users are running the report on one of the tables listed above. I'm sure that's making it become more fragmented and ultimately slowing down the query.
Do you have any suggestion on how I can make the union of these two tables faster? Or is there anything I could do to speed the query besides creating clusted indexes?
Any help would be appreciated....thank you

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Jul 2, 2001

Hi Everybody:

We have a table which needs to be updated 2 million times per day. It hosts all real time transaction. There are 200K records in this table. Would you please to share your experience with me about how to protect/save such table in SQL 2000 from any possible damage?

We plan to use point-in-time backup (every 5 minutes). It still takes at half an hour to recover the whole database. Any new technology from Microsoft or SQL 2000 you can recommend?

Thank you very much.

Joan

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Sep 25, 2001

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Mar 28, 2004

Hi,

I have Oracle 9i. Oracle listener is aborting by itself after every few minutes giving TNSLSNR.exe failed. While listener is running I can do all the activity on the database.

Please let me know if there is any solution.

Thanks in Advance.
Pushpam

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SQL Server Frequently Asked Questions FAQ

Sep 14, 2005

If you have followed a link to this page (i.e. the URL contains "SearchTerms=xxx") please scroll down to see items of interested highlighted

This list of SQL Server Frequently Asked Questions (FAQ) was originally compiled in August 2005 based on the most frequently "read" posts on SQL Team. Since then new links have been added as topics become popular - so it might be better referred to as FGA - Frequently Given Answers!

NC=Indicates that the Article has NOT been checked for relevance. As time goes on these are getting fewer and fewer
The latest change is in Red
Recent changes are in Teal

URL to link to this post: 17Nov2005
http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=55210&SearchTerms=
Followed by either "Keyword1,Keyword2" or "PhraseWord1+PhraseWord2"

The icon allows you to RightClick-CopyShortcut to provide a link to this topic with appropriate keywords - I got bored of having to make them manually! 07Mar2006 Stats

Homework
I put this one at the top, in case you don't read any further. To find out if your homework will be answered on this forum you should see if it qualifies:
Requirements for homework questions 07Mar2006
Example of Failure to meet the minimum requirements 07Mar2006
Learning SQL www.sql-tutorial.net 07May2007
www.firstsql.com/tutor.htm 07May2007
www.w3schools.com/sql/default.asp 07May2007

Why?
Why is my LDF Log File so big / getting bigger / bigger than my MDF 14Oct2005

How to

How to ask a question on SQL Team and get a quick answer - i.e. the information you need to provide 06Nov2006
How to format your question or a reply (in particular see the [code] option 18Sep2007
how to encrypt and decrypt my password 07May2007
Rounding up/down to nearest multiple (e.g. order in dozens, buy at least 30) 28Sep2006
Replace multiple spaces, or other character, with single space 28Sep2006
Generate a Random String 13Sep2006
String comparison 24Jul2006
Article: Images and SQL Server
How to get Images or blobs into SQL table (NC)
Inserting Images as BLOB in SQL server table (NC)
How to use DeBUG window in QUERY Analyzer (NC)
Use a Parameter in the Top clause
Dynamic SQL or How do I SELECT TOP @var records?
Can't insert NULL into table with unique key (NC)
Efficient paging of recordsets with T-SQL
Article: Paging in SQL 2005 07May2007
Execute dynamic SQL that is longer than varchar(8000) 05Oct2005
Convert multiple spaces to single spaces 14Oct2005
Making Upper/Lower Case Sensitive comparison 27Oct2005
Convert to Proper Case (each word starts with capital) 19Feb2006
Deleting a massive number of rows 04Mar2006
Combine values from rows into a column 05Oct2005
i.e.
FOO 1
FOO 2
becomes:
FOO 1,2

CSV / Splitting delimited lists
WHERE IN @MyCSV
Article: Passing a CSV or Array to a Stored Procedure (NC)
Best split functions
and Concatenating data from rows with same GroupBy column
Triggers
Triggers to audit changes
trigger to keep tables matching
Set Update/Modified date column using a trigger 02Nov2005
Deactivating a trigger 07Feb2006

SQL Team Articles
Article: Identity and Primary Keys - and Surogate Keys See also
Article: Sending SMTP Mail using a Stored Procedure (NC)
Article: Dynamic ORDER BY (NC)
Article: More Trees & Hierarchies in SQL (NC)
Article: Using SELECT to INSERT records (NC)
Article: Deleting Duplicate Records
Article: Returning a Row Number in a Query (NC)
Article: Calculating Running Totals (NC)

Datatypes / Collation

GUIDs (NC)
IsGUID check GUID is valid 01Aug2007
DATALENGTH() and LEN() 21Sep2005
Compare BIT columns and a BitMask column 05Jan2006
Collation conflict in Assignment or WHERE clause 05Feb2006
(See "Developer / Techie stuff" below for some other Collation links)

Datatypes - Dates

Time Only Function: F_TIME_FROM_DATETIME 29Apr2006
Date/Time Info and Script Links (including UNIX time) 16Apr2006
Date formatting (
Format Date/Time (NC)
last date of the month (NC)
Getting the date portion of a datetime value or
Round a date to Year, Quarter, Month, Day, Hour or Minute
How to get date in t-sql (NC)
compare date with current date (NC)
convert varchar to datetime (NC)
Compare dates regardless of time? (NC)
Convert varchar to date (NC)
Time in Analog (NC)
Start of Week Function (NC)
Earlier date than 1/1/1753

Techniques

Prevent Administrators accessing a database 14Sep2006
SELECT vs SET 26Sep2005
What is a cursor, Why is it bad? 23Sep2006
Cursor or Not (NC)
TSQL/ SP Best Practices (NC)
case-sensitive (NC)
User-Defined string Functions Transact-SQL (NC)
Passing an array into a stored procedure (NC)
Comparing two tables or views easily (NC)
All Tables in All Databases (NC)
Better Phonetic Matching Algorithm (A better Soundex)
Levenshtein Edit Distance Algorithm (A better Soundex)
Fuzzy matching 01Aug2007
Find tables with no PK (NC)
Function: HTMLDecode (NC)
How to protect errorlogs to tables from rollbacks (NC)
Distance of Zip/Postcodes
Great Circle Formula 07May2007
Haversine Formula 07May2007
Accuracy v. Speed 07May2007 See also here, here, here, here and here and here
Upsert - combined Update/Insert Procedure 01Aug2007 and here
Display all columns but only for rows with the most recent date 01Aug2007

Developer / Techie stuff

Changing column names on referencing objects 07May2007
When was DB object last updated 07May2007
How to clear the whole database 07May2007
Move / Script Development Database Changes to Production Database / Ship Application updates 04Nov2006
Script to analyze table space usage 11Oct2006
What version, and Service Pack, of SQL Server am I using? 23May2006
SQL Beautifier 13Apr2006
Performance / System Monitor / PerfMon - preferred values for counters 04Apr2006
SQL Server 2000 Knowledge Base Articles - updated every 3 days 21Jan2006
Concerns about SQL 2000 SP4 08Jan2006
Support stops for SP3a AND installing sp4 on cluster 26May2006

How to read Mssql transaction log file
Compare data in two tables / two databases 31Oct2005
Recommended books 07Oct2005
Good tools for DBAs 06Oct2005
Best SQL Security Method (NC)
Some query optimalisation (NC)
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Multiple SQL Server 2000 Instances (NC)
Primary Key v. Unique Index (NC)
HOWTO Run SQL Profiler without sysadmin rights (NC)
upgrade from SQL7 to SQL2000 (NC)
xp_cmdshell execute right (NC)
Monitor object usage over time (NC)
size of user tables in a database (NC)
Changing Column Length (NC)
Add, Sub, Mul, Div With Really! Big Numbers (NC)
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Why I'm not a DBA (NC)
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Interview questions (NC)
More Interview questions 11Sep2006
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Developer / Techie stuff - Collation

Bulk Delete of Records 07May2007 and locking issues 01Aug2007
Deleting lots of Records from a large table 01Aug2007
Synchronising data using staging tables 07May2007
Version Control 07May2007
how to change Collate on the server 20Sep2005
How to change default collate in SQL 20Sep2005
Cannot resolve collation conflict for equal to OP 20Sep2005
different Collation Settings between Databases 20Sep2005


Database Design and Structures

Codes - Common Lookup Tables CLT 04Jun2006
Good table naming convention 09May2006
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Finding evidence of sql injection attack
Security Testing: SQL Injection 09May2006


Locking

Using the NOLOCK hint 07Jun2006
how does row locking work (NC)


EMail

sp sending mail (NC)
CDOSYS Send Email (NC)

XML

SQL Server 2000 XML (NC)
Adding an XML Root Tag
Handling tricky namespaces in OpenXML

Backup / Restore / Replication / Jobs / Houskeeping

Backup
How Backup works
What type of backup should I use? - Full, Differential, Transaction? Should I shrink the log? 22Jan2006
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Disaster Procedure Checklist I think I have a database corruption, how do I mitigate any further damage and get upright again? 07May2007
How I Rescue Data from Corrupted Databases 07May2007
Disaster Recovery Plan 07May2007
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Restore
RESTORE syntax / example
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Moving to a new sql server 25Jun2006
Fix Orphaned Users (after a Restore or moving DB to a different server)
Script User Logins after a Restore 01Aug2007
and
Scripting users & logins from one server to another (e.g. after moving DB to a different server) 25Jul2006
how long will take to restore a 10 gb?
All I have is the .bak file
Restoring .BAK file to a different server?
Unable to restore/attach a MDF file (single file attach / sp_attach_single_file_db)
See also: This and this and this


Shrink Database / Files

Shrinking TEMPDB 19Apr2006
Database Shrinking 09Jan2006
Log Shipping -Shrinking Log and Data files (NC)
MSDB Massive msdbdata.mdf

Housekeeping / Maintenance

Tara Blog Houskeeping Routines 06Oct2006
Index Tuning Wizard 07May2007
User Rights for SQL Service 07May2007
When was SQL Server last restarted? 07May2007
Optimising your indexes with DBCC INDEXDEFRAG 06Oct2006
Detach Move Db & Log File Reattach 17Mar2006
Rebuilding Indexes
DBCC CHECDB, CHECKTABLE, NEWALLOC (old)
Suspect Databases after Power Cut?
Jobs failing (NC)
Reindex All Tables in All Databases (old)
deleting replication (NC)

Export / Import / DTS

Copying/backing up DTS Packages (NC)
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Tool to script database records? (i.e. generate INSERT statement script)
How to convert DATE Format from DD/MM/YY to MM/DD/YY in DTS (NC)
Importing an Excel File with DTS (NC)
Is DTS Secure for credit card backup to Access? (NC)
Winzip in scheduled DTS Package (NC)
Article: Using BULK INSERT to Load a Text File (NC)

Output / Reporting / Formatting

Pivot table (NC)
Article: Dynamic Cross-Tabs/Pivot Tables (NC)
which led to:
More Dynamic CrossTabs using T-SQL 04Aug2006 (Jeffs Blog)

Error Messages

SQL Server does not exist or access denied (NC)

Connections

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/3GB in boot.ini on Win2003 standard 19Oct2005
SQL memory /3gb /PAE AWE 19Sep2005
SQL Server Standard & 4GB memory
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MSDE

MSDE Setup fails (NC)
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SQL 2005 / Yukon

Migrating to SQL 2005 Hints and Tips 01Aug2007
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MySQL, Oracle, and the others

MySQL not as good as MS SQL?
Migrating from Oracle to SQL Server

Other

SQL Reporting Service SP2? (NC)

Got an hour .. or ten ... to spare?

Would you work at Elwoo's office?
Simple Quiz
What is a Yak? 07May2007

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Jan 24, 2008

Hey guys. I need a little help once again, here's the problem:

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So we plan to create a program that lets admins check those login/logout data in an SQL Server 2005 database using a Visual Basic as the frontend.

Our only problem is, how do we transfer data from the Access 97 tables to our SQL tables *everytime* it gets updated? We don't need every detail the Access97 table has (it has IDNo, CardNo, Time, Location, plus other useless stuff). We just need to extract the IDNo(int) and Location(varchar) field(we'll just use getdate() for the Time since the update is done in realtime anyway).

So in a way, we are trying to find out a way to technically sync both tables, just like Database Mirroring style.

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May 7, 2007

Hi,

In a project with SQL Servcer 2005 the customer is interested to save (archive) content of a table frequently. They want to have possibility to restore the table content as before. I have suggested to export the table every day to a text file and save the file in Visual source safe. If they need there will be possibility to import the text file later. Now I wonder, is there any other way to do archiving of the table content in SQL Server 2005?

Best regards

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Sep 1, 2015

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Error:
The file group "PRIMARY"  for the database "tempdb" in SQL instance "MSSQLSERVER" on computer "XYZ" is running out of space. 
tempdev Initial size : 133,100 MB Growth: By 10 percent, Limited to 140000 MB 
templog  Initial Size : 5,475 MB    Growth: By 10 percent, Unlimited

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We are getting frequently blocking

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WaitType: LCK_M_S
WaitResourceDatabaseName : ReportServerTempDB
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Oct 10, 2006

Hi guys,
 
            I faced problem related to Locking and Isolation Level on Table(s).
 
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            In current scenario we start transactions with ReadCommitted Lock for updating records. But in this scenario I can€™t get select query result because of some of recourses r used by transactions so after some time it gives Deadlock error.
 

          So I want solution like both operation run simultaneously and get only committed records at a time of transaction running
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Error:

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tempdev Initial size : 133,100 MB Growth: By 10 percent, Limited to 140000 MB
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Connection is Native OLE DBSQL Native Client. When i test connectio it succeeds

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Jul 23, 2005

Hi All,I'm trying to track down a mysterious problem we're experiencing inwhich updates and inserts to tables in our mssql2k server appear to be'disappearing.'To explain our situation:We have a web page (written in ASP, if that's relevant) on which weaccept enrollment information.When that page is submitted, the form data is passed to a storedprocedure on our mssql2k server, which performs several operations,all of which are wrapped in a transaction.In particular, the stored procedure performs an update operation on arecord in one table (i'll call it TableA) and an insert into anothertable (TableB).If the procedure encounters a problem (ie after each update / insertoperation in the procedure we test for IF @@Error<>0) it performs arollback, performs a select similar to the one immediately below, andthen RETURNs.SELECT '1' as error, 'Unable to update TableA' as errormsgIf the procedure doesn't fail any of the @@Error tests, thetransaction is committed, and a membership number is SELECTed to bereturned.SELECT '0' as error, @memnum as membershipnumberThe @memnum variable is populated within the transaction.Back in the ASP page we test both for the proc returning an emptyrecordset, or for it passing an explicit value in the error field, andpush the page to an error page if either of these conditions are met.If, on the other hand, none of these conditions are met, and themembershipnumber field in the recordset is populated with a validmembership number, we push to a confirmation page.This confirmation page receives the membership number in a sessionvariable, performs a SELECT against TableB (the table that receivedthe insert during the proc) using that membership number in the WHEREclause, and the resultant recordset is used to populate theconfirmation details on that page. That recordset is also then used topopulate the details of a confirmation email, which is automaticallysent by the confirmation page.And now here's our problem: we've become aware of a handfull of peoplewho have gone through the enrollment process, have received theconfirmation email containing the information they supplied asexpected, but the data appears to be entirely missing from our tables.By that I mean that the record in TableA does not appear to have beenupdated (under normal circumstances that record should have hadseveral flags set, and several other fields updated with informationsupplied by the person enrolling), and the record in TableB does notappear to have been inserted.In essence, looking at our tables, it *feels* like the transaction inthe stored procedure for that particular enrollment hit a problem andwas rolled back. However, the evidence that we have in the form of theconfirmation email argues strongly that the data must have existed inour tables (particularly in TableB), if only for an unknown period oftime.We're kind of at our wit's end to work out what is going wrong withthese enrollments. From my understanding of transactions (and I couldwell be wrong) any changes to data (ie updates, inserts etc) containedwithin are essentially 'invisible' to any other operation (ie theSELECT that happens in the confirmation page) until the transaction iscommitted, implying that the effect of the update and insert shouldhave been 'permanently' successful if no error code is received and ifa valid membership number was returned. I ask, because someone in ourteam has suggested that maybe the operations in the transaction'lasted long enough' in the tables to have been visible for the SELECTon the confirmation page to have worked, but were then subsequentlyrolled back, explaining why the confirmation email is appropriatelypopulated and why the data then appears to be missing. However, as Isaid, this doesn't match my understanding of how transactions behave.Sorry for the length of this post, but I felt it was best to explainthis as best as I could.Does anyone have any advice they can give us on this situation? ie,are there any known problems with operations in transactions 'bleedingover' into tables, but then being rolled back at some later point?Does anyone have any thoughts or suggestions on how we can furtherdiagnose this issue?Truly, any help will be immensely appreciated...Thanks in advance,M Wells

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